Abstract: The relationship between the performance index and the processor utilization of real-time control tasks in different control phases is analyzed,and a fuzzy feedback scheduling system for real-time control tasks is proposed.By monitoring the current error of real-time control tasks and its derivative in real time,the fuzzy controller queries the fuzzy control decision-making table(FDT) and assigns priority to tasks dynamically,then the processor utilization is assigned to a task by feedback scheduler according to the priority.Simulation result shows that this method can improve the performance of real-time control tasks under limited computing resource.